US Date Format Regex

^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/\d{4}$

Match US date format MM/DD/YYYY with basic validation for month and day ranges.

Test This Pattern →

Pattern Breakdown

Understanding the regex pattern ^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/\d{4}$:

  • ^ - Start of string
  • $ - End of string
  • \d - Any digit (0-9)
  • [...] - Character class
  • (...) - Capturing group
  • {n,m} - Quantifier (n to m times)
  • | - Alternation (OR)

Examples

Input Result Explanation
01/15/2024 ✓ Match Valid US date
12/31/2024 ✓ Match End of year
13/01/2024 ✗ No Match Invalid month

Code Examples

JavaScript

JavaScript
const pattern = /^(0[1-9]|1[0-2])\/(0[1-9]|[12][0-9]|3[01])\/\d{4}$/;
const text = "01/15/2024";

// Test if string matches
if (pattern.test(text)) {
  console.log("Valid!");
}

// Extract matches
const matches = text.match(pattern);
console.log(matches);

Python

Python
import re

pattern = r'^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/\d{4}$'
text = "01/15/2024"

# Test if string matches
if re.match(pattern, text):
    print("Valid!")

# Find all matches
matches = re.findall(pattern, text)
print(matches)

PHP

PHP
<?php
$pattern = '/^(0[1-9]|1[0-2])\/(0[1-9]|[12][0-9]|3[01])\/\d{4}$/';
$text = "01/15/2024";

// Test if string matches
if (preg_match($pattern, $text)) {
    echo "Valid!";
}

// Find all matches
preg_match_all($pattern, $text, $matches);
print_r($matches);
?>

Java

Java
import java.util.regex.*;

String pattern = "^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/\\d{4}$";
String text = "01/15/2024";

Pattern p = Pattern.compile(pattern);
Matcher m = p.matcher(text);

if (m.matches()) {
    System.out.println("Valid!");
}

Use Cases

Common applications: US applications, legacy systems, user input

Frequently Asked Questions

What is the regex pattern for us date format regex?
The regex pattern is: ^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/\d{4}$. Match US date format MM/DD/YYYY with basic validation for month and day ranges.
How do I use the us date format regex pattern in JavaScript?
In JavaScript: const regex = new RegExp('^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/\\d{4}$'); or const regex = /^(0[1-9]|1[0-2])\/(0[1-9]|[12][0-9]|3[01])\/\d{4}$/;
Does this pattern work in Python?
Yes, use: import re; pattern = re.compile(r'^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/\d{4}$') in Python. Most regex patterns are cross-language compatible.
What are common use cases for us date format regex?
US applications, legacy systems, user input

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